STMicroelectronics

SM4T18AY

SM4T18AY Description

The SM4T18AY from STMicroelectronics is a high-performance unidirectional TVS (Transient Voltage Suppression) diode designed for robust automotive-grade surge protection. Part of the SM4TY, TRANSIL™ series, it features a 15V reverse standoff voltage and a 16.7V minimum breakdown voltage, ensuring reliable clamping of transient voltages up to 32.5V at peak pulse current (Ipp). With a 400W peak pulse power rating and 71A surge current capability (8/20µs), it excels in dissipating high-energy transients. Packaged in a surface-mount SMA format with Tape & Reel (TR), it is optimized for automated assembly and complies with ROHS3 and REACH standards.

SM4T18AY Features

• Automotive-Grade Reliability: Meets stringent automotive requirements for durability and performance.
• High Surge Handling: 400W peak pulse power and 71A (8/20µs) surge current for robust transient suppression.
• Precise Voltage Clamping: 32.5V max clamping voltage ensures protection for sensitive downstream components.
• Low Leakage: 15V reverse standoff voltage minimizes power loss during normal operation.
• Compact & Robust: SMA package with MSL1 (Unlimited) moisture sensitivity, ideal for space-constrained designs.
• Compliance: ROHS3, REACH, and ECCN EAR99 certified for global use.

SM4T18AY Applications

• Automotive Electronics: Protects ECUs, infotainment systems, and CAN buses from load dump and ESD events.
• Industrial Systems: Safeguards PLC I/Os, sensors, and power supplies against inductive switching transients.
• Consumer Electronics: Used in USB ports, HDMI interfaces, and power management circuits for surge suppression.
• Telecom Infrastructure: Defends base stations and networking equipment from lightning-induced surges.

Conclusion of SM4T18AY

The SM4T18AY stands out as a high-reliability TVS diode for automotive and industrial applications, combining high surge capability, precise clamping, and compact packaging. Its unidirectional design and 400W power rating make it ideal for protecting sensitive electronics from transient voltages, ensuring system longevity and compliance with industry standards. A top choice for engineers prioritizing performance, durability, and miniaturization.